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VIR

VIR ball valves for pool and technical-room pipework

Here you will find thermoplastic shut-off valves supplied under the VIR name, intended for the threaded pipework that runs between pump, filter, heater and the pool itself. The range on this page is built around the Type 220 polypropylene ball valve in DN25 with a female thread and a 16 bar rating, finished in black. It is the kind of component that is easy to overlook when planning a filtration circuit, and the first thing you miss when a pump needs isolating and the only way to do it is to drain the whole line.

What the range covers

A ball valve of this type consists of a moulded body, a spherical plug with a through bore, seats either side of the ball, stem seals and a handle. Turning the handle through a quarter of a turn moves the bore from fully in line with the pipe to fully across it, which means the valve is either open or closed rather than throttled. The straight-through bore keeps pressure loss low when the valve is open, so it can be left permanently in a suction or return line without noticeably loading the pump.

  • Dimensiune: DN25, the nominal bore designation that corresponds to 1″ threaded connections.
  • Conexiune: female thread, so it mates with male threaded adaptors, nipples and transition fittings.
  • Material: polypropylene body, a thermoplastic widely used for cold and lukewarm water pipework.
  • Presiune: rated 16 bar, far above the working pressure of a domestic filtration circuit.
  • Tip: Type 220, the series designation to quote when matching or replacing an existing valve.

Choosing the right size and connection

Nominal sizing causes more ordering mistakes than anything else, because DN figures, inch threads and pipe outside diameters are three different scales. DN25 and 1″ describe the same nominal bore; they do not describe the outside diameter of the pipe or socket that screws into it. Before ordering, check what is actually on the end of your existing line: a 1″ male thread on a pump union, a threaded socket glued to solvent-weld pipe, or a compression adaptor. Measure the thread across the crests with a caliper and compare it with the fitting you intend to remove rather than estimating by eye.

A few further points are worth checking:

  • Thread standard: confirm whether the surrounding pipework uses the same parallel or tapered threads so that sealing is done by the right method.
  • Sealing method: threaded thermoplastic joints are normally made with PTFE tape or a suitable thread sealant, applied to the male part.
  • Temperature: ratings for plastics are quoted at ambient temperature and reduce as the water gets warmer, so allow margin on heated circuits.
  • Mass-media: a valve on a dosing or chemical line sees very different conditions from one on plain filtered water; check compatibility before fitting.
  • Clearance: allow room for the handle to swing a full quarter turn, which is easy to forget in a crowded manifold.

Where a shut-off valve earns its place

In a filtration circuit, isolating valves sit either side of the pump and either side of the filter so that a strainer basket, a pump seal or a multiport valve can be serviced without emptying the pipework. They are also used on each individual suction point, on heat pump bypass loops, on backwash lines and on feeds to counter-current units or water features, where being able to balance or close a branch independently makes commissioning much simpler. Keeping the body out of direct sunlight, or shading it where that is not possible, helps any plastic valve last longer.

Maintenance and wear points

Ball valves have few moving parts, but the parts that do move are the ones that fail. Seats and stem seals harden over time, particularly on lines carrying treated water, and a valve that is left in one position for years can become stiff. Operating each valve fully open and fully closed once or twice a season keeps the ball surface clean and the seals working. A weep at the stem when the handle is turned, a drip at a threaded joint, or a handle that spins without closing the flow are all signs that replacement is due. Because the valve is a self-contained assembly, it is usually simpler and more reliable to fit a new one than to attempt a rebuild.

VIR at PoolParthub.com

Here we list the VIR Type 220 polypropylene ball valve in DN25 with a 1″ female thread and a 16 bar rating, chosen because it covers the single most common isolating size in domestic and small commercial pool pipework.

If you are replacing an existing valve, quote the size, the thread form and the Type 220 designation so the new part drops straight into the gap left by the old one. If you are building a new technical room, planning an isolating valve at every point you might later want to service will save far more time than it costs.